基于USB2.0總線的圖象采集系統

電氣自動化論文編號:ZD314  論文字數:8938,頁數:27

 目    錄
  
 一　引言 1
 二　系統功能的實現原理 2
 2.1 系統實現目標 2
 2.2 系統的工作原理 2
 2.3 系統的實現流程 2
 三  系統硬件設計 3
 3.1 圖像傳感器OV7720 3
 3.2 USB控制器FX2 3
 3.3 通用串行總線（USB）概述 4
 3.3.1 USB2.0系統的結構 4
 3.3.2 USB 2.0總線協議 5
 3.3.3　數據流類型 5
 3.3.4　USB通信 6
 四　系統的應用程序設計 7
 4.1 MFC簡介 7
 4.2設備的訪問 7
 4.3讀取設備數據 9
 4.4關閉設備 10
 4.5 顯示模塊 10
 4.5.1 位圖部分 10
 4.5.2 構造位圖并顯示 12
 4.6 實時顯示圖像模塊 15
 4.7 保存圖像模塊 16
 五  結束語 20
 謝辭 21
 參考文獻 22

摘    要

 圖像采集系統采用實時圖像采集技術，在當今各個領域都有著極其廣泛的應用，如使用在醫療器械、工業控制、圖像模式識別等各個領域。
 本設計介紹了一個基于USB2.0總線的圖像采集系統。本系統中，首先通過攝像頭OV7220采集圖像信息，然后再傳輸給USB芯片EZ-USB FX2進行進一步的處理，再通過USB總線傳輸給主機，實現實時顯示。本文主要講述了其應用程序設計，應用程序利用VC++編寫。首先利用VC的MFC生成應用程序界面和相應的命令按鈕，再編寫C++代碼實現相應的功能。命令按鈕實現的功能有打開、關閉USB設備，接收發送過來的圖像信息、并構造位圖、實現圖像的實時顯示，還能保存用戶感興趣的圖像。本文詳細的講解了位圖的基本結構、位圖的構造、位圖的顯示和保存、主機和USB設備之間通信、讀寫USB設備和控制USB設備。
 
關鍵詞：圖像采集　　EZ-USB FX2　　USB   

Image acquisition system design Base on USB2.0
( Application Design)
ABSTRACT

 Image acquisition system which uses real-time image acquisition technology has a very wide range of applications in various fields today, such as used in medical equipment, industry control, image pattern recognition, and other fields.
 An image acquisition system which delivers image data based on USB 2.0 is introduced in this design. The system, first of all, through camera OV7220 collects images information, and then transfers to the USB chip EZ-USB FX2 for further treatment, and then through the USB bus transfers to the host, achieves real-time display. This article is mainly on its application design programmed by VC + +.First application interface and the corresponding order buttons are made by the MFC of VC, and then the C + + code are programmed to achieve the corresponding function. the functions of the order buttons are to open and close the USB devices, accept the image information and structure of bitmap to achieve real-time display images that can saved by users if interested in the image. This article detailed introduces the basic structure of the bitmap, the display and preservation of the bitmap, the communications between the host and USB devices, reading and writing USB devices, controlling USB devices.
 
Key words：Image Acquisition    EZ-USB FX2    USB